Processes for preparing substituted chromanol derivatives
申请人:Pfizer Inc.
公开号:US06096906A1
公开(公告)日:2000-08-01
The invention relates to processes for preparing a compound of the formula (X) and the enantiomer of said compound, wherein the benzoic acid moiety is attached at position 6 or 7 of the chroman ring, and R.sup.1, R.sup.2 and R.sup.3 are as defined herein. The invention further relates to intermediates that are useful in the preparation of the compound of formula (X). ##STR1##
Acceptorless Dehydrogenative Cross-Coupling of Primary Alcohols Catalyzed by an N-Heterocyclic Carbene–Nitrogen–Phosphine Chelated Ruthenium(II) Complex
The acceptorless dehydrogenativecross-coupling of primaryalcohols to form cross-esters with the liberation of H2 gas was enabled using a [RuCl(η6-C6H6)(κ2-CNP)][PF6]Cl complex as the catalyst. This sustainable protocol is applicable to a broad range of primaryalcohols, particularly for the sterically demanding ones, featuring good functional group tolerance and high selectivity. The good catalytic
使用 [RuCl(η 6 -C 6 H 6 )(κ 2 -CNP)][PF 6 ]Cl 络合物,可以实现伯醇的无受体脱氢交叉偶联以形成交叉酯并释放 H 2气体催化剂。这种可持续的协议适用于广泛的伯醇,特别是对于空间要求高的伯醇,具有良好的官能团耐受性和高选择性。良好的催化性能可归因于氮-膦功能化的N-杂环卡宾(CNP)配体,它采用面配位模式以及配位苯的容易解离。
[EN] PROCESSES AND INTERMEDIATES FOR PREPARING SUBSTITUTED CHROMANOL DERIVATIVES<br/>[FR] PROCEDE ET INTERMEDIAIRES POUR LA PREPARATION DE DERIVES DE CHROMANOL SUBSTITUES
申请人:PFIZER INC.
公开号:WO1998011085A1
公开(公告)日:1998-03-19
(EN) The invention relates to processes for preparing a compound of formula (X) and the enantiomer of said compound, wherein the benzoic acid moiety is attached at position 6 or 7 of the chroman ring, and R1, R2, and R3 are as defined herein. The invention further relates to intermediates that are useful in the preparation of the compound of formula (X).(FR) L'invention concerne des procédés de préparation d'un composé de formule (X) et l'énantiomère dudit composé. Dans ladite formule (X), la fraction d'acide benzoïque est attachée en position 6 ou 7 du cycle chromane, et R1, R2 et R3 sont tels que définis dans la description. L'invention porte aussi sur des intermédiaires qui sont utiles dans la préparation du composé de formule (X).
The invention relates to processes for preparing a compound of the formula
1
and the enantiomer of said compound, wherein the benzoic acid moiety is attached at position 6 or 7 of the chroman ring, and R
1
, R
2
, and R
3
are as defined herein. The invention further relates to intermediates that are useful in the preparation of the compound of formula X above.
Processes and intermediates for preparing substituted chromanol derivatives
申请人:Pfizer Inc.
公开号:US06444826B1
公开(公告)日:2002-09-03
The invention relates to processes for preparing a compound of the formula
and the enantiomer of said compound, wherein the benzoic acid moiety is attached at position 6 or 7 of the chroman ring, and R1, R2, and R3 are as defined herein. The invention further relates to intermediates that are useful in the preparation of the compound of formula X above.