Enantio- and diastereoselective aldol reactions of achiral ethyl and methyl ketones with aldehydes: the use of enol diisopinocampheylborinates
作者:Ian Paterson、Jonathan M. Goodman、M. Anne Lister、Russell C. Schumann、Cynthia K. McClure、Roger D. Norcross
DOI:10.1016/s0040-4020(01)85588-5
日期:1990.1
from achiral ethyl and methyl ketones by enolisation in the presence of tertiary amine bases (iPr2NEt or Et3N), undergo enantio- and diastereoselectivealdolreactions with aldehydes. The reagents employed, (+)- and (-)-(Ipc)2BOTf, are easily prepared in enantiomerically pure form in two steps from (-)- and (+)-α-pinene, respectively. The aldolreaction between ethyl ketones and aldehydes using (+)- or
Mechanistic insights from ab initio calculations on a nitrogen analogue of the boron-mediated aldol reaction
作者:Anna Bernardi、Cesare Gennari、Jonathan M. Goodman、Volker Leue、Ian Paterson
DOI:10.1016/0040-4020(95)00170-d
日期:1995.4
Molecular orbital calculations were used to study a nitrogen analogue of the boron mediated aldol reaction. Experimental results show that high selectivity can be obtained in some cases, at the cost of low yields. The molecular orbital calculations are used to analyse the experimental results and to suggest modifications to the experimental procedure. The results suggest an explanation for a puzzling reversal of selectivity in the aldol reactions of methyl ketones.
Aldol reactions of methylketones using chiral boron reagents: A reversal in aldehyde enantioface selectivity
作者:Ian Paterson、Jonathan M. Goodman
DOI:10.1016/s0040-4039(00)95300-0
日期:1989.1
Synthesis of the C12–C24 fragment of peloruside A by silyl-tethered diastereomer-discriminating RCM
作者:Emma M. Casey、Paul Teesdale-Spittle、Joanne E. Harvey
DOI:10.1016/j.tetlet.2008.09.133
日期:2008.12
The C12–C24 fragment of peloruside A has been synthesized using, as a key step, a silyl-tethered ring closing metathesis reaction to form the C16–C17 (Z)-alkene. The metathesis reaction discriminates between diastereoisomers of the starting material. A diphenylsilyl bis-ether provides simultaneous protection for the C15 and C24 hydroxyl groups, and is expected to lead to high 1,5-anti selectivity in