Asymmetric Horner–Wadsworth–Emmons (HWE) reac- tion of prochiral cyclic ketones is of current interest.1—4) Sev- eral useful chiral HWE reagents such as phosphonates,5—9) phosphonoamides,10) and phosphonoamidates11) have been developed for the synthesis of olefins possessing an axis of chirality. However, most of these reagents are restricted to the compounds with non-stereogenic phosphorus atom. Al- though Motoyoshiya et al. reported ...
