ds and create two new stereocenters. This family of Р reactions includes the functionalization of alkenes with boron, nitrogen, and oxygen moieties Р stereo-, regio-, and enantioselectively. (研究背景) However, the stereocontrolled transfer of Р sulfur and selenium to alkenes remains underdeveloped; in fact, no example of a catalytic, Р asymmetric thiofunctionalization of an unactivated olefin is extant. (研究现状) Given the Р prevalence of sulfur in certain classes of natural products, as well as the rich chemistry of Р sulfur that allows for further manipulations, a reliable and highly enantioselective method for Р vicinal thiofunctionalization is of interest. (本文工作) [J. Am. Chem. Soc. 2011, 133, 15308] Р3) The [5+2] dipolar cycloaddition of oxidopyrylium ylides and two-carbon dipolarophiles Р 6
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