Single-Handed Helical Poly(quinoxaline-2,3-diyl)s Bearing Achiral 4-Aminopyrid-3-yl Pendants as Highly Enantioselective, Reusable Chiral Nucleophilic Organocatalysts in the Steglich Reaction
作者:Takeshi Yamamoto、Ryo Murakami、Michinori Suginome
DOI:10.1021/jacs.6b12349
日期:2017.2.22
Helically chiral poly(quinoxaline-2,3-diyl)s bearing 4-aminopyrid-3-yl pendants were synthesized as new helical-polymer-based chiral nucleophilic organocatalysts. The obtained chiral nucleophilic polymer catalysts exhibited high catalytic activity, enantioselectivity, and reusability in asymmetric Steglich rearrangement of oxazolyl carbonate to C-carboxyazlactone. The polyquinoxaline-based, helically
带有 4-aminopyrid-3-yl 侧链的螺旋手性聚 (quinoxaline-2,3-diyl)s 被合成为新的基于螺旋聚合物的手性亲核有机催化剂。获得的手性亲核聚合物催化剂在恶唑基碳酸酯不对称 Steglich 重排为 C-羧基唑内酯中表现出高催化活性、对映选择性和可重复使用性。与已知的基于小分子的手性有机催化剂相比,基于聚喹喔啉的螺旋手性 DMAP 催化剂选择性介导分子内酰基转移,后者也介导分子间酰基转移。