Pd-Catalyzed Threefold Arylation of Baylis-Hillman Bromides and Acetates with Triarylbismuth Reagents
作者:Maddali L. N. Rao、Somnath Giri
DOI:10.1002/ejoc.201200543
日期:2012.8
alkyl 2-benzylacrylates and 2-benzylacrylonitriles were synthesized by means of atom-economic cross-couplings of Baylis–Hillmanbromides or acetates with BiAr3 under palladium-catalyzed conditions. These reactions, involving threefold aryl couplings using BiAr3 reagents with bromides and acetates, are fast and are completed in 1–2 h with high product yields.
approach to the diastereoselective synthesis of noncoded β-hydroxy-α-amino esters from Morita–Baylis–Hillman (MBH) adducts is described. The strategy is based on a one-pot sequence involving an oxidative cleavage of the double bond of silylated Morita–Baylis–Hillman adducts, followed by the reaction with hydroxylamine hydrochloride/pyridine to form oximes. The stereoselective reduction of the oximes with
摘要 描述了一种简单直接的方法,可以从森田-贝利斯-希尔曼(MBH)加合物中非对映选择性合成非编码β-羟基-α-氨基酯。该策略基于一锅法,其中涉及甲硅烷基化的森田-贝利斯-希尔曼加合物的双键的氧化裂解,然后与盐酸羟胺/吡啶反应生成肟。用MoCl 5 ·nH 2 O / NaBH 3 CN混合物对肟进行立体选择性还原,可分四个步骤产生相应的抗-β-羟基-α-氨基酯,总收率良好,非对映选择性高于95%。对合成方法的略微修改已允许外消旋合成一组非编码的α-氨基酯/酸和DOPA。 描述了一种简单直接的方法,可以从森田-贝利斯-希尔曼(MBH)加合物中非对映选择性合成非编码β-羟基-α-氨基酯。该策略基于一锅法,其中涉及甲硅烷基化的森田-贝利斯-希尔曼加合物的双键的氧化裂解,然后与盐酸羟胺/吡啶反应生成肟。用MoCl 5 ·nH 2 O / NaBH 3 CN混合物对肟进行立体选择性还原,可分四个步
作者:Manickam Bakthadoss、Tadiparthi Thirupathi Reddy、Vishal Agarwal、Duddu S. Sharada
DOI:10.1039/d1cc06097j
日期:——
of two same molecules via dual C–Hbondactivation in an intermolecular fashion has been developed using a distal ester-directing group. This new coupling reaction led to the synthesis of the highly functionalized 1,3-diaryl molecular architecture in very good yields and with high chemo- and regioselectivities. In addition, using ester as the distal directing group, orthoC–H olefination of α-methyl