First asymmetric synthesis of both enantiomers of andirolactone
摘要:
We have achieved the first asymmetric synthesis of (+)- and (-)-andirolactone. The key steps were separation of limonene oxide diastereomers, asymmetric oxidation induced by the chiral intermediate and ring-closing metathesis in the presence of catalytic amounts of Lewis acid to form the spirocyclic butenolides. (c) 2006 Published by Elsevier Ltd.
Expanding the Chiral Monoterpene Pool: Enantioselective Diels–Alder Reactions of α-Acyloxy Enones
作者:Skyler D. Mendoza、Michael Rombola、Yujia Tao、Stephan J. Zuend、Roland Götz、Martin J. McLaughlin、Sarah E. Reisman
DOI:10.1021/acs.orglett.2c01343
日期:2022.6.3
α-acyloxy enones has been developed to synthesize chiral oxidized cyclohexenes. Yttrium(III) triflate, in conjunction with a chiral pyridinebisimidazoline (PyBim) ligand, was found to catalyze the asymmetric [4 + 2] cycloaddition with a variety of dienes and α-acyloxy enone dienophiles. Using this method, terpinene-4-ol, a key intermediate in the synthesis of commercial herbicide cinmethylin, can be prepared