A Stille cyclisation approach to (−)-periplanone-B: studies in alkene-selective ring-closing metathesis and an improved chromium(II)-mediated synthesis of (E )-alkenylstannanes from aldehydes
作者:David M. Hodgson、Anne M. Foley、Lee T. Boulton、Peter J. Lovell、Graham N. Maw
DOI:10.1039/a905560f
日期:——
A synthesis of the dienone 7 via an efficient intramolecular Stille cross-coupling reaction, an improved chromium(II)-mediated synthesis of (E)-alkenylstannanes from aldehydes using Bu3SnCHI2 in DMF, and a synthesis of the substituted (â)-dienone 25 via ring-closing alkene metathesis to give dihydropyran 22 are described. The synthesis of (â)-dienone 25 constitutes a formal synthesis of (â)-periplanone-B.
A seven-step synthesis of S-(+)-hydroprene (S-1) in similar to 20% overall yield starting from S-(+)-3,7-dimethyl-1,6-octadiene (2) of 55+/-10% optical purity is described. The introduction of an optical enhancement step in the synthetic sequence at the stage of S-(-)-3,7-dimethyl-1-octanol (9) raises the optical purity of S-1 from similar to 50% to similar to 80%.
SEREBRYAKOV, EDWARD P.;CONG, HAO NGUYEN;MAVROV, M. V., PURE AND APPL. CHEM., 62,(1990) N0, C. 2041-2046
作者:SEREBRYAKOV, EDWARD P.、CONG, HAO NGUYEN、MAVROV, M. V.
DOI:——
日期:——
A Stereocontrolled Access to (±)-, (−)-, and (+)-Patchouli Alcohol
The racemate and both enantiomers of patchouli alcohol have been synthesized by stereocontrolled routes. The olfactive properties of the patchouli alcohols prepared are reported.