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.
A protecting-group-free synthesis of arbusculone, andirolactone, pinnatolide, ipomolactone, cyclocapitelline and isocyclocapitelline
作者:Srinivas Gajula、Madasu Madhu、Suresh Kumar Chintakrinda、J.S. Yadav、Debendra K. Mohapatra
DOI:10.1016/j.tetlet.2018.10.024
日期:2018.11
A general approach for a collective synthesis of natural products containing substituted THF ring is described. In this paper, Arbusculone, a small molecule natural product accomplished using a short route, is used as the key intermediate to achieve the total synthesis of Andirolactone, Pinnatolide, Ipomolactone, Cyclocapitelline, Isocyclocapitelline and their two isomers in less than ten steps. The
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