The Enantioselective Conversion of Three-Membered Ring Sulfoxides (Episulfoxides) into Alkenyl Sulfoxides using Chiral Lithium Amide Bases
作者:Alexander Blake、Susan Westaway、Nigel Simpkins
DOI:10.1055/s-1997-948
日期:1997.8
A novel type of chiral lithium amide base reaction, involving the rearrangement of certain types of unsymmetrical ring-fused episulfoxides, gives alkenyl sulfoxide products in up to 88% ee. The structure of one product, including its absolute stereochemistry, was determined by X-ray crystallography, following oxidation of the sulfoxide to the corresponding alkenyl sulfone.
一种新型的手性锂酰胺碱反应,涉及某些类型的非对称环融环氧化物的重排,生成的烯基氧化硫产物的ee高达88%。在将亚砜氧化成相应的烯基砜后,通过 X 射线晶体学确定了一种产物的结构,包括其绝对立体化学结构。
GIBLIN, GERARD M. P.;RAMCHARITAR, STEVE H.;SIMPKINS, NIGEL S., TETRAHEDRON LETT., 29,(1988) N 33, C. 4197-4200
作者:GIBLIN, GERARD M. P.、RAMCHARITAR, STEVE H.、SIMPKINS, NIGEL S.
DOI:——
日期:——
Concerning the synthesis and enantioselective rearrangements of episulfoxides
作者:Alexander J. Blake、Paul A. Cooke、Jackie D. Kendall、Nigel S. Simpkins、Susan M. Westaway
DOI:10.1039/a908391j
日期:——
A novel synthesis of episulfoxides having the norbornane skeleton is possible by use of a rhodium catalyst to effect SO transfer from trans-stilbene episulfoxide to norbornene or norbornadiene. Analogous Rh2(OAc)4 catalysed sulfur transfer to these alkenes is also possible using propylene sulfide as the sulfur source. These methods did not give useful yields of products with alternative types of alkene substrate.
A novel type of chiral lithium amide base reaction, involving the rearrangement of certain types of symmetrical ring-fused episulfoxides, gives alkenyl sulfoxide products in up to 88% ee. The structures of the products, including absolute stereochemistry, were assigned based on X-ray crystal structure determinations.
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Synthesis and stereoselective chemistry of a novel cyclopentadienyl sulphone
作者:Gerard M.P. Giblin、Steve H. Ramcharitar、Nigel S. Simpkins
DOI:10.1016/s0040-4039(00)80454-2
日期:1988.1
The synthesis of a novel cyclopentadienyl sulphone (3) has been achieved by two routes, one of which involves a previously unsuccessful alkylation of the sulphone carbanion (4), some preliminary chemistry of the new diene is also reported.