Enantioselective Phase-Transfer Catalyzed α-Sulfanylation of Isoxazolidin-5-ones: An Entry to β<sup>2,2</sup>-Amino Acid Derivatives
作者:Timothée Cadart、Clément Berthonneau、Vincent Levacher、Stéphane Perrio、Jean-François Brière
DOI:10.1002/chem.201603910
日期:2016.10.17
An unprecedented enantioselective α‐functionalization of C4‐substituted N‐alkoxycarbonyl isoxazolidin‐5‐ones, readily available platforms from Meldrum's acid derivatives, by N‐sulfanylphthalimide (PhthSR) electrophiles was achieved upon an efficient phase‐transfer catalytic approach, mediated by a commercial N‐spiro quaternary ammonium catalyst. Two catalytic activities of the in situ formed R4N+Phth−
C4取代的前所未有的对映选择性α-官能ñ -烷氧基羰异恶唑烷-5-酮,从Meldrum酸衍生物容易获得的平台上,通过Ñ -sulfanylphthalimide(PhthSR)亲电子物于一种有效的相转移催化方法实现的,由商业介导的N螺环季铵催化剂。形成的R原位的两个催化活性4 Ñ + PHTH -物种所强调的,phtalimidate被卷入阴离子置换事件和可能作为布朗斯台德碱。此序列提供到α,α-二取代的isoxazolidinones,这被证明是有用的前体的直接的访问α -硫烷基- β 2,2-氨基酸衍生物。