Lipase-mediated diastereoselective and enantioselective acetylations of 3-substituted cyclohexanols
摘要:
Lipase-mediated acetylation of four diastereomeric and enatiomeric isomers of 3-substituted cyclohexanols 2 has led to an efficient resolution to provide a single stereoisomer, (1R,3S)-cyclohexyl acetate (1R,3S)-3 in a high enantiomeric excess. (C) 1998 Elsevier Science Ltd. All rights reserved.
Phase-Vanishing Methodology for Efficient Bromination, Alkylation, Epoxidation, and Oxidation Reactions of Organic Substrates
作者:Nirmal K. Jana、John G. Verkade
DOI:10.1021/ol035391b
日期:2003.10.1
to the U-tube method is to employ a solvent with greater density than the fluorous phase, such as 1,2-dibromoethane. This modification has been successfully applied to the methylation of a phenol derivative with dimethylsulfate and to the m-CPBA-induced epoxidation of alkenes, N-oxide formation from nitrogen-containing compounds, and S-oxide or sulfone formation from organic sulfides.
Preventive and/or Therapeutic Agent for Diabetic Vascular Disorder and Respiratory Disorder
申请人:Satoh Keisuke
公开号:US20080312336A1
公开(公告)日:2008-12-18
The present invention provides preventive and/or therapeutic agents for either one, or both, of a diabetic vascular disorder and a diabetic respiratory disorder comprising, as an active ingredient, a cyclohexenone long chain alcohol compound represented by the following formula (1):
[wherein R
1
, R
2
, and R
3
each represent a hydrogen atom or a methyl group, and X represents a linear or branched C10-C28 alkylene or alkenylene group].
Since the cyclohexenone long chain alcohol of formula (1) improves diabetic vascular smooth muscle contraction and bronchial smooth muscle contraction, it is useful as a preventive and/or therapeutic agent for a diabetic vascular disorder or a respiratory disorder.
Cyclohexenone long-chain alcohol and medicament containing same
申请人:Meiji Milk Products Co., Ltd.
公开号:US06228893B1
公开(公告)日:2001-05-08
Described is a cyclohexenone long-chain alcohol represented by the formula (1):
wherein R1, R2 and R3 each independently represents a hydrogen atom or a methyl group and X represents a C10-18 alkylene or alkenylene group. The cyclohexanone long-chain alcohol according to the present invention has excellent neurite growth stimulating effects and is therefore useful as a preventive and/or therapeutic agent for Alzheimer's disease.
Facile nucleophilic substitution of 3-tert-butyl-dimethylsilyloxyalk-2-enylphosphonium salts
作者:Phil Ho Lee、Minkyoung Cho、In-Sup Han、Sunggak Kim
DOI:10.1016/s0040-4039(99)01438-0
日期:1999.9
Phosphoniosilylation of α,β-enones with TBSOTf and triphenyl-phosphine at 0 °C affords 3-tert-butyldimethylsilyloxyalk-2-enylphosphonium salts, which undergo facile nucleophilicsubstitution with various nucleophiles to give 3-substituted silyl enol ethers in good yields.
Tin radical mediated [5+1]-annulation methodsleading to 3-substituted cyclohexanones were investigated. Cyclohexanones having a quaternary center at the 3-position were synthesized in good yields by allyltin-mediated three- and four-component cascade reactions that involve (i) radical carbonylation, (ii) 6-endo cyclization, and (iii) alkene addition.