Regio‐ and Enantioselective Synthesis of Trifluoromethyl‐Substituted Homoallylic α‐Tertiary NH
<sub>2</sub>
‐Amines by Reactions Facilitated by a Threonine‐Based Boron‐Containing Catalyst
作者:Diana C. Fager、Ryan J. Morrison、Amir H. Hoveyda
DOI:10.1002/anie.202001184
日期:2020.7.6
alkyl‐, a chloro‐, or a bromo‐substituted Z ‐alkene, can either be purchased or prepared by catalytic stereoretentive cross‐metathesis. What is more, Z ‐trisubstituted allyl boronates may be used. Various chemo‐, regio‐, and diastereoselective transformations of the α‐tertiary homoallylic NH2‐amine products highlight the utility of the approach; this includes diastereo‐ and regioselective epoxide f
介绍了一种催化区域和对映选择性合成三氟甲基取代的,芳基,杂芳基,烯基和炔基取代的均烯丙基α-叔NH 2-胺的方法。易于合成且功能强大的N-甲硅烷基酮亚胺原位转化为NH-酮亚胺,然后与Z-烯丙基硼酸酯反应。易于获得的基于l-苏氨酸的氨基酚基硼基催化剂促进了转化,可提供所需的产物,产率高达91%,α:γ选择性> 98:2,Z:E选择性> 98:2 ,> 99 :1对映体比率。可以使用市售的氨基苯酚,以及可能含有烷基,氯或溴取代的Z的硼酸烯丙酯烯烃可以购买或通过催化立体保持交叉复分解制备。而且,可以使用Z-三取代的烯丙基硼酸酯。α-叔均丙基NH 2-胺产物的各种化学,区域和非对映选择性转化突出了该方法的实用性。这包括非对映和区域选择性环氧化物的形成/三氯乙酸裂解以生成分化的二醇衍生物。