Camphor-derived thioureas: Synthesis and application in asymmetric Kabachnik-Fields reaction
作者:Pogula Sreekanth Reddy、Motakatla Venkata Krishna Reddy、Peddiahgari Vasu Govardhana Reddy
DOI:10.1016/j.cclet.2016.01.046
日期:2016.6
Abstract A series of camphor-derived thiourea organocatalysts 3a–f were designed and synthesized from (1 R ,3 S )-camphoric acid 1 and applied to the one-pot three-component Kabachnik–Fields reaction. Catalyst 3c was found to be an efficient organocatalyst for the reaction of 2-cyclopropylpyrimidin-4-carbaldehyde 4 , various amines 5, and diphenylphosphite 6 to yield the corresponding enantioselective
摘要从(1 R,3 S)-樟脑酸1设计合成了一系列樟脑衍生的硫脲有机催化剂3a-f,并将其应用于一锅三组分Kabachnik-Fields反应。发现催化剂3c是2-环丙基嘧啶-4-甲醛4,各种胺5和亚磷酸二苯酯6反应生成相应的对映选择性α-氨基膦酸酯7a–e的有效有机催化剂,产率为74%–82%,而14% –35%ee。