Stereocontrolled synthesis of the key intermediate for the enantioselective synthesis of clerodane natural products
摘要:
Stereocontrolled synthesis of (+)-trans-decalone 7 (R = CH=CH2) from (-)-verbenone (5), readily obtainable from (+)-nopinone (2), is described. The compound 7 possesses four correctly arranged chiral centers, C(5)-C(10)-C(9)-C(8), necessary for the enantioselective synthesis of neo-trans-clerodanes. (C) 1997 Elsevier Science Ltd.
The first enantioselective synthesis of the title neo-trans-clerodanes 3 and 4b from (-)-verbenone 5 has been accomplished using the ene reaction and stereoselective conjugate addition reaction to the enone 13 as the key step. (C) 1999 Elsevier Science Ltd. All rights reserved.