@article { ISI:000312607100004, title = {Asymmetric synthesis of (+)-stagonolide C and (-)-aspinolide A via organocatalysis}, journal = {Tetrahedron-Asymmetry}, volume = {23}, number = {22-23}, year = {2012}, month = {DEC}, pages = {1534-1541}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A new enantioselective synthesis of two important fungal metabolites, (+)-stagonolide C and (-)-aspinolide A, has been described from readily available raw materials. Praline catalyzed asymmetric alpha-aminooxylation and Jorgensen{\textquoteright}s epoxidation of aldehydes are the key reactions employed in the introduction of chirality. The formation of the 10-membered lactone core structure was finally accomplished via Steglich esterification and ring closing metathesis reactions. (C) 2012 Elsevier Ltd. All rights reserved.

}, issn = {0957-4166}, doi = {10.1016/j.tetasy.2012.10.007}, author = {Shelke, Anil M. and Rawat, Varun and Suryavanshi, Gurunath and Sudalai, Arumugam} } @article { ISI:000359134700008, title = {Efficient one pot regioselective synthesis of a 3,3 {\textquoteleft}-spiro-phosphonylpyrazole-oxindole framework via base mediated [1,3]-dipolar cycloaddition reaction of the Bestmann-Ohira reagent with methyleneindolinones}, journal = {Organic \& Biomolecular Chemistry}, volume = {13}, number = {32}, year = {2015}, month = {JUL}, pages = {8669-8675}, publisher = {ROYAL SOC CHEMISTRY}, address = {THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND}, abstract = {

A one pot, highly regioselective synthesis of racemic 3,3{\textquoteright}-spiro-phosphonylpyrazole-oxindole by 1,3-dipolar cycloaddition of an in situ generated anion of dialkyl 1-diazomethylphosphonate from the Bestmann-Ohira reagent (BOR) \& methyleneindolinones has been developed. The synthesis affords the highly functionalized pyrazole scaffolds in good yields with excellent regioselectivity under mild reaction conditions within a short reaction time.

}, issn = {1477-0520}, doi = {10.1039/c5ob01020a}, author = {Shelke, Anil M. and Suryavanshi, Gurunath} } @article { ISI:000363828500010, title = {Efficient organocatalytic route for asymmetric total synthesis of stagonolide F}, journal = {Tetrahedron Letters}, volume = {56}, number = {45}, year = {2015}, month = {NOV}, pages = {6207-6209}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A stereoselective total synthesis of Stagonolide F (98\% ee) is described employing asymmetric alpha-aminooxylation, Jorgensen{\textquoteright}s asymmetric epoxidation, Brown asymmetric allylation, Steglich esterification and ring closing metathesis as key steps. The use of organocatalytic alpha-aminooxylation and Jorgensen{\textquoteright}s asymmetric epoxidation of aldehydes for the introduction of chirality makes this approach more attractive. (C) 2015 Elsevier Ltd. All rights reserved.

}, keywords = {alpha-Aminooxylation, Jorgensens{\textquoteright}s asymmetric epoxidation, Macrolide, Ring-closing metathesis, Total synthesis}, issn = {0040-4039}, doi = {10.1016/j.tetlet.2015.09.082}, author = {Shelke, Anil M. and Suryavanshi, Gurunath} } @article { ISI:000381847500009, title = {Fluoride-assisted synthesis of 1,4,5,6-tetrahydropyridazines via [4+2] cyclodimerization of in situ-generated azoalkenes followed by a C-N bond cleavage}, journal = {Organic Letters}, volume = {18}, number = {16}, year = {2016}, month = {AUG}, pages = {3968-3971}, publisher = {AMER CHEMICAL SOC}, address = {1155 16TH ST, NW, WASHINGTON, DC 20036 USA}, abstract = {

An unexpected CsF-assisted C-N bond cleavage was exploited to synthesize highly functionalized and biologically important 1,4,5,6-tetralrydropyridazine derivatives from alpha-halo N-acylhydrazohes in excellent yields. The extrusion of nitrogen and the [4 + 2] cycloaddition between in situ-generated azoalkenes is a key reaction in the process. The identified methodology is suitable for synthesizing a wide variety of analogues of tetrahydropyridazines, which are prevalent in many medicinally important small molecules. The reaction conditions are mild, high-yielding, and amenable for the gram scale.

}, issn = {1523-7060}, doi = {10.1021/acs.orglett.6b01551}, author = {Shelke, Anil M. and Suryavanshi, Gurunath} } @article { ISI:000370108700010, title = {Formal synthesis of pinolide via L-proline-catalyzed sequential alpha-aminooxylation, horner-wadsworth-emmons olefination and sharpless asymmetric dihydroxylation}, journal = {Tetrahedron-Asymmetry }, volume = {27}, number = {2-3}, year = {2016}, month = {FEB}, pages = {142-147}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, abstract = {

A convergent, formal enantioselective synthesis of pinolide, a new nonenolide, has been achieved with high enantiomeric purity (99\% ee) starting from readily available raw materials. The main highlight of the synthetic strategy is the application of L-proline catalyzed sequential alpha-aminooxylation and Horner-Wadsworth-Emmons olefination of an aldehyde, Sharpless asymmetric dihydroxylation and Steglich esterification as the key steps for the construction of a key chiral intermediate of the target molecule. (C) 2016 Elsevier Ltd. All rights reserved.

}, issn = {0957-4166}, doi = {10.1016/j.tetasy.2016.01.005}, author = {Shelke, Anil M. and Suryavanshi, Gurunath} } @article {43539, title = {Efficient Sn(II)-catalyzed one-pot synthesis of a 3-substituted azetidine-2,4-dione framework}, journal = {Organic \& Biomolecular Chemistry}, volume = {15}, year = {2017}, month = {MAR}, pages = {2385-2391}, abstract = {A novel Sn(II)-catalyzed tandem cyclization reaction of aromatic aldehydes with ethyl cyanoacetate has been achieved to afford a series of 3-substituted azetidine-2,4-diones in good to excellent yields. This protocol provides straightforward access to construct the azetidine core through sequential Knoevenagel condensation, hydration and the C-N cyclization reaction.}, doi = {10.1039/c7ob00294g}, author = {Chavan, Santosh S. and Supekar, Mrudul V. and Burate, Pralhad A. and Rupanwar, Bapurao D. and Shelke, Anil M. and Suryavanshi, Gurunath} } @article {44524, title = {Metal-free annulation of β-acylamino ketones: facile access to spirooxazolines and oxazolines via oxidative C{\textendash}O bond formation}, journal = {Organic Chemistry Frontiers }, volume = {5}, year = {2018}, month = {OCT}, pages = {544-548 }, abstract = {A metal-free annulation reaction of β-acylamino ketone derivatives has been reported for the synthesis of a group of functionalized spirooxazolines and oxazolines in good to excellent yields. The reaction proceeds via phenyliodine(III) diacetate (PIDA)-mediated oxidative C{\textendash}O bond formation in the presence of BF3{\textendash}OEt2. The mild reaction conditions, broad substrate scope, simple execution and synthetic potential of the products make this novel protocol very attractive.}, doi = {10.1039/C7QO00783C}, author = {Chavan, Santosh S. and Rupanawar, Bapurao D. and Kamble, Rohit B. and Shelke, Anil M. and Gurunath Suryavanshi} }