Hexahydronaphthalene ester derivatives, their preparation and their
申请人:Sankyo Company, Limited
公开号:US05451688A1
公开(公告)日:1995-09-19
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 hydrogen or a group of formula and --OR.sup.6 ; R.sup.6, R.sup.6a and R.sup.6b are each hydrogen, a hydroxy-protecting group, alkyl, alkanesulfonyl, halogenated alkanesulfonyl or arylsulfonyl] 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.
Acyclic α,α‐disubstituted β‐phosphonyl esters containing chiral alcoholic auxiliaries were efficiently prepared and evaluated for the lithium naphthalenide‐mediated asymmetric reductive alkylation. Among which, the best diastereoselectivity was received from the substrates bearing a (−)‐phenylmenthyl group in leading to alkylated esters with up to 83:17 dr. The diastereoselectivity is proven to be
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
Chiral N,N-disubstituted amides may be readily synthesized by reacting an anhydride with l- or d-ephedrine.
通过使酸酐与1-或d-麻黄碱反应,可以容易地合成手性N,N-二取代的酰胺。
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.