Efficient Synthesis of the A-Ring Phosphine Oxide Building Block Useful for 1α,25-Dihydroxy Vitamin D<sub>3</sub> and Analogues
作者:Andrzej R. Daniewski、Lisa M. Garofalo、Stanley D. Hutchings、Marek M. Kabat、Wen Liu、Masami Okabe、Roumen Radinov、George P. Yiannikouros
DOI:10.1021/jo0161577
日期:2002.3.1
The 1 alpha-hydroxy A-ring phosphine oxide 1, a useful building block for vitamin Danalogues, was synthesized from (S)-carvone in nine synthetic operations and a single chromatographic purification in 25% overall yield. The synthesis features two novel efficient synthetic transformations: the Criegee rearrangement of alpha-methoxy hydroperoxyacetate 10 in methanol to obtain directly the desired secondary
Process and intermediates useful to produce vitamin D analogs
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.