Enantioselective Construction of Cyclic Quaternary Centers: (−)-Mesembrine
作者:Douglass F. Taber、Timothy D. Neubert
DOI:10.1021/jo001237g
日期:2001.1.1
stage for subsequent intramolecular alkylidene C-H insertion to give, after ozonolysis and aldol condensation, (-)-mesembrine 1. Amide 2 should be a useful chiron for the enantioselective construction of cyclicquaternarycenters.
Syntheses of two naturally occurring monoterpenes with the santolinyl skeleton
作者:Derek V. Banthorpe、Paul N. Christou
DOI:10.1039/p19810000105
日期:——
isolated fromArtemisiatridentata, has been proved to be 1,4,4-trimethyl-6-vinyl-3-oxabicyclo[3.1.0]hexane by an unambiguous synthesis in six steps from 1-chloro-2-methylpropene, and is thus an irregularmonoterpene of the santolinyl class. The availability of 3,6,6-trimethyl-5,6-dihydro-2H-pyran as an unexpected minor product of one of the steps allowed an efficient eight-step synthesis from the chloro-compound