<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Gunjal, Vidya B.</style></author></authors><secondary-authors><author><style face="normal" font="default" size="100%">Reddy, Shrinivasa D.</style></author></secondary-authors></contributors><titles><title><style face="normal" font="default" size="100%">Synthetic studies towards Pseudoxylallemycin B, an antibiotic active against gram-negative bacteria: total synthesis of 3-epi-Pseudoxylallemycin B</style></title><secondary-title><style face="normal" font="default" size="100%">Tetrahedron Letters</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Cyclic tetrapeptides</style></keyword><keyword><style  face="normal" font="default" size="100%">Epimerization</style></keyword><keyword><style  face="normal" font="default" size="100%">Gram-negative bacteria</style></keyword><keyword><style  face="normal" font="default" size="100%">Macrolactamization</style></keyword><keyword><style  face="normal" font="default" size="100%">Propyl phosphonic anhydride (T3P)</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2018</style></year></dates><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">In an attempt towards the total synthesis of Pseudoxylallemycin B, a homo dimeric, N-methylated macrocyclic tetrapeptidic natural product, synthesis of its epimer at position 3 (d-Tyr instead of l-Tyr) is described here. During the course of synthesis we came across a striking yet unusual observation of complete epimerization which led to the formation of 3-epi-Pseudoxylallemycin B.</style></abstract><work-type><style face="normal" font="default" size="100%">Journal Article</style></work-type><custom3><style face="normal" font="default" size="100%"> Foreign</style></custom3><custom4><style face="normal" font="default" size="100%">2.193</style></custom4></record></records></xml>