An Aluminum Dihydride Working as a Catalyst in Hydroboration and Dehydrocoupling
作者:Zhi Yang、Mingdong Zhong、Xiaoli Ma、Karikkeeriyil Nijesh、Susmita De、Pattiyil Parameswaran、Herbert W. Roesky
DOI:10.1021/jacs.6b00032
日期:2016.3.2
The well-defined aluminum dihydride LAlH2 (L = HC(CMeNAr)2, Ar = 2,6-Et2C6H3) (1) operates in catalysis like a transition metal complex. The catalytic activity of 1 for hydroboration of terminal alkynes was investigated. Furthermore, catalyst 1 effectively initiated the dehydrocoupling of boranes with amines, thiols, and phenols, respectively, to form compounds with B-E bonds (E = N, S, O) under elimination
The palladium-catalyzed cross-coupling reaction of 9-organothio-9-borabicyclo[3.3.1]nonanes with organic electrophiles: Synthesis of unsymmetrical sulfides
palladium-catalyzed cross-couplingreaction of 9-organothio-9-borabicyclo[3.3.1]nonane (9-RS-9-BBN) with organicelectrophiles, such as iodoarenes, l-iodo-l-alkenes, allyl carbonate and propargyl carbonate. Iodoarenes and l-iodo-l-alkenes were smoothly converted into the corresponding sulfides at 50°C in the presence of PdCl2((dppf) 3 mol%) and K3PO4 (3 equiv.) in DMF. In contrast, the cross-couplingreaction of 9-RS-9-BBN
不对称硫化物的合成通过钯催化9-有机硫-9-硼环[3.3.1]壬烷(9-RS-9-BBN)与有机亲电子试剂(如碘代芳烃)的交叉偶联反应而高收率地进行,1-碘-1-烯烃,碳酸烯丙酯和碳酸炔丙酯。在存在于DMF中的PdCl 2((dppf)3 mol%)和K 3 PO 4(3当量)的情况下,在50℃下将碘代芳烃和1-碘-1-烯烃平稳地转化为相应的硫化物。相反,在DMF中9-RS-9-BBN与烯丙基或炔丙基碳酸酯的交叉偶联反应在没有碱的帮助下发生。Pd(dba)2催化的两个反应-dppf区域选择性地产生烯丙基和烯丙基硫化物,产率极高。讨论了反应的范围和局限性,以及改变反应条件的影响。