Enantioselective synthesis of the essential oil and pheromonal component ar-himachalene by a chiral pool and chirality induction approach
作者:Subhash P. Chavan、Harshali S. Khatod
DOI:10.1016/j.tetasy.2012.09.008
日期:2012.10
The enantioselective synthesis of both isomers of ar-himachalene has been achieved starting from enantiomerically pure citronellal and p-methyl alpha-methyl styrene as an application of a chiral pool and chirality induction approach, respectively. The key reactions involved in the synthesis include the Sharpless asymmetric dihydroxylation for the induction of chirality at benzylic carbon bearing the methyl group and the use of a hypervalent iodine reagent or trimethylsilyldiazomethane (TMSCHN2) for the six to seven membered ring expansion. (C) 2012 Elsevier Ltd. All rights reserved.
Enantiospecific total synthesis of (+)-laevigatin
作者:Subhash P. Chavan、Vijay D. Dhondge、Sachindra S. Patil、Y.Tripura Subba Rao、Chitra A. Govande
DOI:10.1016/s0957-4166(97)00284-x
日期:1997.8
The first enantiospecific, total synthesis of (+)-laevigatin from (+)-citronellal is described. (C) 1997 Published by Elsevier Science Ltd.
Asymmetric synthesis of (R)-ar-curcumene, (R)-4,7-dimethyl-l-tetralone, and their enantiomers via cobalt-catalyzed asymmetric Kumada cross-coupling
An efficient and concise asymmetric synthesis of (R)-(+)-ar-curcumene, (R)-4,7-dimethyl-1-tetralone, and their enantiomers was accomplished. The key step to construct the stereogenic benzylmethyl centers of these natural products is the cobalt-catalyzed asymmetric Kumada cross-coupling reaction of a racemic alpha-bromo ester. (C) 2015 Elsevier Ltd. All rights reserved.