氯化亚砜 、 (2S)-2-乙基-2-甲基戊酸 反应 1.0h,
以The whole of the (-)-(2S)-2-ethyl-2-methylvaleryl chloride obtained in this manner的产率得到(-)-(2S)-2-ethyl-2-methylvaleryl chloride
参考文献:
名称:
Hexahydronaphthalene ester derivatives, their preparation and their
A Practical Chiral Bicyclic Thioglycolate Lactam Auxiliary for Stereoselective Quaternary Carbon Formation
作者:Azélie Arpin、Jeffrey M. Manthorpe、James L. Gleason
DOI:10.1021/ol060106k
日期:2006.3.1
[reaction: see text] Chiralbicyclic thioglycolate lactams may be prepared in three steps from inexpensive commercial materials. The resulting lactams may be alkylated three times, twice using basic enolization and once using reductive enolization, to form alpha-quaternary carboxylic acid derivatives in high yield and with high diastereoselectivity. The alkylation products may be cleaved under either
Synthetically useful β,γ-unsaturated carbonyl compounds having a quaternary carbon at the α-position were prepared with high stereoselectivity by the reaction of a dienolate anion derived from α,β-unsaturated imide having a chiral auxiliary and electrophiles (ethylacetate and allyl iodide as the C2 and C3 unit, respectively). This method was applied to a short asymmetric synthesis of (+)-ethosuximide
The synthesis of (S) 2-ethyl-2-methylpentanoic acid 13 from the C-5 aldehydo ester 1, obtained through a baker's yeast transformation, via C-2 and C-1chain elongations by means of olefin-forming reactions is reported.
Hexahydronaphthalene ester derivatives their preparation and their
申请人:Sankyo Company, Limited
公开号:US05827855A1
公开(公告)日:1998-10-27
Compounds of formula (I): ##STR1## wherein R.sup.1 represents a group of formula (II) or (III): ##STR2## R.sup.2 is alkyl, alkenyl or alkynyl; R.sup.3 and R.sup.4 are each hydrogen, alkyl, alkenyl or alkynyl; R.sup.5 is hydrogen or a carboxy-protecting group; R.sup.a is a group of formula --OR.sup.6 ; R.sup.6 is hydrogen; R.sup.6a and R.sup.6b are each hydrogen, a hydroxy-protecting group, alkyl, alkanesulfonyl, halogenated alkanesulfonyl or arysulfonyl, and their salts and esters. Such compounds inhibit the synthesis of cholesterol, and can be used for the treatment and prophylaxis of hypercholesterolemia and of various cardiac disorders.
Hexanhydronaphthalene ester derivatives, their preparation and their therapeutic uses
申请人:SANKYO COMPANY LIMITED
公开号:EP0605230A1
公开(公告)日:1994-07-06
Compounds of formula (I):
[wherein R1 represents a group of formula (II) or (III):
R2 is alkyl, alkenyl or alkynyl ; R3 and R4 are each hydrogen, alkyl, alkenyl or alkynyl ; R5 is hydrogen or a carboxy-protecting group ; Ra is hydrogen or a group of formula and -OR6 ; R6, R6a and R6b are each hydrogen, a hydroxy-protecting group, alkyl, alkanesulphonyl, halogenated alkanesulphonyl or arylsulphonyl] and their salts and esters have the ability to inhibit the synthesis of cholesterol, and can thus be used for the treatment and prophylaxis of hypercholesterolemia and of various cardiac disorders.