A new synthesis of(-)-rishitin (1) is reported, starting with chiral pool molecules. The crucial step is a stereoselective vinyl radical cyclization, which gives a 10:1 ratio of 21 to 22. (C) 1997 Elsevier Science Ltd.
作者:Miguel A. González、Subhash Ghosh、Fatima Rivas、Derek Fischer、Emmanuel A. Theodorakis
DOI:10.1016/j.tetlet.2004.04.181
日期:2004.6
5-isopropenyl-3-methyl-cyclohex-2-enone, (isocarvone) (2), in enantiomerically pure form is reported. Both enantiomers of 2 can be produced by manipulation of carboxylic acid 5, which is available fromR-(−)-carvone (1). These materials provide new chiral building blocks that could be used in total synthesis of natural products and related opticallyactive compounds.