申请人:Hoffmann-La Roche Inc.
公开号:US06353123B1
公开(公告)日:2002-03-05
A stereospecific method for accomplishing the below reaction:
results in the compound of formula 2 having the same stereochemistry at both carbon 1 and carbon 3 as that in the compound of formula 1. Thus, if carbon 3 is in the R-configuration in the compound of formula 1, then carbon 3 will be in the R-configuration in the compound of resulting formula 2. In the above process, R1 is C1-C6 alkyl that can be straight-chain or branched. The process functions using a fluorinated alcohol having a pKa less than about 9, in the presence of a palladium catalyst. The compounds of formula 1, as well as novel intermediates in this process, are useful in manufacturing vitamin D analogs.
一种立体选择性的方法,用于完成以下反应:产生化合物2的公式,其在碳1和碳3上的立体化学与公式1中的立体化学相同。因此,如果公式1中的碳3处于R-构型,则产生的公式2中的碳3也将处于R-构型。在上述过程中,R1是C1-C6烷基,可以是直链或支链。该过程使用pKa小于约9的氟化醇,在钯催化剂的存在下发挥作用。公式1的化合物以及该过程中的新型中间体在制造维生素D类似物方面是有用的。