作者:A. Stephen K. Hashmi、Anna Littmann
DOI:10.1002/asia.201200046
日期:2012.6
Based on the gold‐catalyzed synthesis of methyleneoxazolines, a one‐pot combination with an Alder‐ene reaction was developed. For azodicarboxylates, good to very good yields (51–99 %) of the oxazolemethylhydrazinedicarboxylates were achieved with 3 mol % of the Gagosz catalyst, [Ph3PAuNTf3]. In a less‐selective reaction, 4‐phenyl‐3H‐1,2,4‐triazol‐3,5(4 H)‐dione gave lower yields (41–49 %) of the corresponding
基于金催化的亚甲基恶唑啉的合成,开发了一种与Alder-ene反应的单锅法组合。对于偶氮二羧酸盐,使用3 mol%的Gagosz催化剂[Ph 3 PAuNTf 3 ] ,可以获得好至非常好的产率(51–99%)的恶唑甲基肼二羧酸酯。在选择性较低的反应中,4-苯基-3H-1、2,4-三唑-3,5(4 H)-二酮的相应恶唑甲基苯基三唑烷二酮的收率较低(41-49%)。总体而言,形成了五个新债券。四甲基氨基乙烯通过在-40℃下的[2 + 2]环加成反应得到环丁烷衍生物,但是仅获得45%的螺环化合物。金上的KITPHOS配体较难获得,在较低的催化剂负载量(2 mol%)下,收率更高,但需要更长的反应时间。