C. Kashima et al., DIASTEREOMERIC PREPARATION OF ALPHA-PHENYLTHIO AND BETA-PHENYLTHIO SUBSTITUTED N-ACYLPYRAZOLES, Heterocycles, 42(1), 1996, pp. 241-250
When 3-phenyl-l-menthopyrazole was used as a chiral auxiliary, the dia
stereomeric preparation of alpha- and beta-phenylthio-substituted N-ac
ylpyrazoles (4 and 9) was accomplished in high yield by the alpha-sulf
enylation using diphenyl disulfide and the conjugate addition of thiop
henol, respectively.