The iodonium ionmediatedringexpansion of the olefinic cyclobutanols 19, 20, and 22 gave the mixture of iodoalkylated cyclopentanones 27a–c and 28a–c, respectively. On the other hand, the same reaction of 24 – 26 afforded stereoselectively the iodoalkylated cyclopentanones 27d and 27e.
A novel and efficient route to chiral A-ring aromatic trichothecanes—The first enantiocontrolled total synthesis of (-)-debromofiliformin and (-)-filiformin
first enantiocontrolled total synthesis of (-)-debromofiliformin (7a) and (-)-filiformin (7b) starting from 11via the regiocontrolled cyclization of the phenolic allyl alcohol 25 to the A-ringaromatictrichothecane 26, were reported.
The first example of asymmetric dihydroxylation (AD) of the cyclopropylidene derivatives 4a-e followed by enantiospecific 1,2-rearrangement of the resulted diols 5a-e to give the optically active cyclobutanones 7a-e was reported. The synthesis of 7e constitutes an enantioenriched formal total synthesis of (-)-filiformin (8).
New reactions of 1-seleno-1-vinyl cyclopropanes
作者:S. Halazy、A. Krief
DOI:10.1016/s0040-4039(01)82951-8
日期:1981.1
HALAZY, S.;KRIEF, A., TETRAHEDRON LETT., 1981, 22, N 43, 4341-4344