P. Ferraboschi et al., Chemoenzymatic syntheses of (25R)- and (25S)-25-hydroxy-27-nor-cholesterol, a steroid bearing a secondary hydroxy group in the side chain, TETRAHEDR-A, 10(13), 1999, pp. 2497-2500
(25R)- and (25S)-25-hydroxy-27-nor-cholesterol 1c, were prepared by enzymat
ic resolution of the stereogenic center in the side chain of compound 4a or
by synthesis of the side chain using, as a chiral synthon, the enantiomeri
cally pure phenylsulfonyl alkanol 6a prepared by different biocatalytic app
roaches. (C) 1999 Elsevier Science Ltd. All rights reserved.