首次合成了二齿次膦酸酯配体1,2-双(二叔丁基次膦氧基)乙烷(t Bu 2 POCH 2 CH 2 OP t Bu 2)。在存在这种配体的情况下,通过Pd催化含α-H的亚胺的羰基化反应,可以得到高收率和化学选择性的各种N-酰基酰胺。同时,不含α-H的亚胺可以转化为N-酰基亚胺,通过直接添加格利雅试剂即可形成受阻酰胺。
2‐bis(di‐tert‐butylphosphinoxy)ethane (tBu2POCH2CH2OPtBu2) was synthesized. In the presence of this ligand, various N‐acyl enamides were obtained in good yields and chemoselectivity by Pd‐catalyzed carbonylation reaction of imines containing α‐H. Meanwhile, imines without α‐H could be transformed to N‐acyl imines, which form highly hindered amides by straightforward addition of Grignard reagents.
首次合成了二齿次膦酸酯配体1,2-双(二叔丁基次膦氧基)乙烷(t Bu 2 POCH 2 CH 2 OP t Bu 2)。在存在这种配体的情况下,通过Pd催化含α-H的亚胺的羰基化反应,可以得到高收率和化学选择性的各种N-酰基酰胺。同时,不含α-H的亚胺可以转化为N-酰基亚胺,通过直接添加格利雅试剂即可形成受阻酰胺。
Substituted pyridyltriazines
申请人:Bayer Aktiengesellschaft
公开号:US05240926A1
公开(公告)日:1993-08-31
New substituted pyridyltriazines of the formula (I) ##STR1## in which R.sup.1 and R.sup.2 have the meanings given in the description, and their use for combating pests. The compounds can be prepared by analogous processes, for example by reacting pyridylamidine hydrochloride with suitable methyl imidates or with suitable benzene-isothiocyanates, or by desulphurising mercapto-substituted pyridyltriazines or by reacting them with alcohols. The mercapto-substituted compounds are also new and can be prepared by analogous processes.