One-pot stereocontrolled cycloalkanone synthesis using 1,3-dithiane 1-oxides
作者:Philip C. Bulman Page、Stephen J. Shutlleworth、Mark B. Schilling、David J. Tapolczay
DOI:10.1016/s0040-4039(00)91839-2
日期:1993.10
Lithium enolates of 2-acyl-1,3-dithiane 1-oxides, generated in one pot from 1,3-dithiane 1-oxide, undergo highly diastereoselective alkylation upon treatment with alkyl iodides; similar in situ treatment of these substrates with diiodoalkanes furnishes the corresponding medium-ring cycloalkanones with extremely high diastereoselectivity and in moderate to good yields.
Diastereoselectivity in the addition of grignard reagents to ketones controlled by the 1,3-dithiane 1-oxide asymmetric building block
作者:Philip C. Bulman Page、Jeremy C. Prodger、Donald Westwood
DOI:10.1016/s0040-4020(01)80562-7
日期:1993.1
2-Acyl-1,3-dithiane 1-oxides undergo diastereoselectiveaddition of Grignardreagents; the degree of selectivity observed is highly dependent upon the solvent and the halide counter-ion used; very high selectivities have been observed under certain reaction conditions.
Diastereoselective electrophilic amination of ketone enolates in 2-substituted 2-acyl-1,3-dithiane 1-oxides
作者:Philip C.Bulman Page、Steven M. Allin、Eric W. Collington、Robin A.E. Carr
DOI:10.1016/0040-4039(94)85237-5
日期:1994.4
Enolate anions derived from 2-substituted 2-acyl-1,3-dithiane 1-oxides react readily with the nitrogen electrophile di-tert-butyl azodicarboxylate (DBAD) to give α-aminoketones with good diastereoselectivity and in reasonable yields; in some cases diastereoselectivity appears sufficiently high that the minor isomer cannot be detected by 400 MHz 1H NMR spectroscopy.
由2-取代的2-酰基-1,3-二硫杂环丁烷1-氧化物衍生的乙醇酸根阴离子易于与亲电氮的偶氮二羧酸二叔丁酯(DBAD)反应生成具有良好非对映选择性和合理收率的α-氨基酮。在某些情况下,非对映选择性显得足够高,以至于较小的异构体无法通过400 MHz 1 H NMR光谱法检测到。
Page, Philip C. Bulman; Westwood, Donald; Slawin, Alexandra M. Z., Journal of the Chemical Society. Perkin transactions I, 1989, p. 1158 - 1160
作者:Page, Philip C. Bulman、Westwood, Donald、Slawin, Alexandra M. Z.、Williams, David J.