@article { ISI:000249394900019,
	title = {Efficient synthesis of azetidine-2,3-diones from L-(+)-diethyl tartrate},
	journal = {Synlett},
	number = {14},
	year = {2007},
	month = {SEP},
	pages = {2242-2246},
	publisher = {GEORG THIEME VERLAG KG},
	type = {Article},
	address = {RUDIGERSTR 14, D-70469 STUTTGART, GERMANY},
	abstract = {<p>A convenient route to enantiopure azetidine-2,3-diones is described. The chiral ketene generated from commercially available L-(+)-diethyl tartrate on Staudinger cycloaddition with different imines gave spiro-beta-lactams in good yields. These spiro-beta-lactams were transformed into azetidine-2,3-diones in excellent yields in a two-step process.</p>},
	keywords = {Cycloaddition, imines, lactams, spiro compounds, stereoselective synthesis},
	issn = {0936-5214},
	doi = {10.1055/s-2007-985563},
	author = {Chincholkar, Pinak M. and Puranik, Vedavati G. and Deshmukh, Abdul Rakeeb A. S.}
}
@article { ISI:000294656400011,
	title = {One-step stereospecific strategy for the construction of the core structure of the 5,11-methanomorphanthridine alkaloids in racemic as well as in optically pure form: synthesis of (+/-)-pancracine and (+/-)-brunsvigine},
	journal = {European Journal of Organic Chemistry},
	number = {24},
	year = {2011},
	month = {AUG},
	pages = {4571-4587},
	publisher = {WILEY-V C H VERLAG GMBH},
	address = {PO BOX 10 11 61, D-69451 WEINHEIM, GERMANY},
	abstract = {<p>The unique core structure of the complex pentacyclic 5,11-methanomorphanthridine has been constructed stereospecifically in one step by an intramolecular [3+2] cycloaddition of a non-stabilized azomethine ylide (AMY), generated by the sequential double desilylation of 14 using (AgF)-F-I as a one-electron oxidant. The formation of the single diastereomer in the key step is explained by the preferred transition state produced by endo attack of the AMY on the {\textquoteleft}{\textquoteleft}Re{\textquoteright}{\textquoteright} face of the dipolarophile. An asymmetric version of the cycloaddition using a chiral dipolarophile was applied to construct the core structure 68 with 63 \% ee. This strategy was successfully applied to the formal synthesis of (+/-)-pancracine and the total synthesis of (+/-)-brunsvigine. An unprecedented and interesting skeletal rearrangement product 49 was observed during the attempted assembly of the E ring from 46 through Horner-Wadsworth-Emmons reactions. Mechanisms involving azetidinium salt formation or the Grob-type fragmentation are advanced to explain the observed rearrangement.</p>},
	keywords = {alkaloids, Azomethine ylides, Cycloaddition, Ring-closing metathesis, synthesis design},
	issn = {1434-193X},
	doi = {10.1002/ejoc.201100601},
	author = {Pandey, Ganesh and Kumar, Ravindra and Banerjee, Prabal and Puranik, Vedavati G.}
}
