多米诺钯催化双O-H键活化形成C-C和C-O键:合成6,6-二烷基-6 H-苯并[ c ]苯并二甲基苯
摘要:
提出了α,α-二烷基-(2-溴芳基)甲醇有效的钯催化多米诺反应为6,6-二烷基-6 H-苯并[ c ]色烯的反应。它们的形成可以通过一个五元的Pd(II)循环来解释,该循环有效地涉及与第二个分子的多米诺骨牌同质偶联,β碳裂解以及最后的分子内布赫瓦尔德-哈特维格环化。这种多米诺骨牌工艺实际上涉及打破五个σ键(2C–Br,2O–H和C–C)和形成两个新的σ键(CC和C–O)。这种机理途径是前所未有的,并进一步说明了过渡金属催化的作用。
多米诺钯催化双O-H键活化形成C-C和C-O键:合成6,6-二烷基-6 H-苯并[ c ]苯并二甲基苯
摘要:
提出了α,α-二烷基-(2-溴芳基)甲醇有效的钯催化多米诺反应为6,6-二烷基-6 H-苯并[ c ]色烯的反应。它们的形成可以通过一个五元的Pd(II)循环来解释,该循环有效地涉及与第二个分子的多米诺骨牌同质偶联,β碳裂解以及最后的分子内布赫瓦尔德-哈特维格环化。这种多米诺骨牌工艺实际上涉及打破五个σ键(2C–Br,2O–H和C–C)和形成两个新的σ键(CC和C–O)。这种机理途径是前所未有的,并进一步说明了过渡金属催化的作用。
Domino [Pd]-Catalysis: One-Pot Synthesis of Isobenzofuran-1(3<i>H</i>)-ones
作者:Lodi Mahendar、Gedu Satyanarayana
DOI:10.1021/acs.joc.6b01396
日期:2016.9.2
An efficient domino [Pd]-catalysis for the synthesis of isobenzofuran-1(3H)-ones is presented. The strategy shows broad substrate scope and is amenable to o-bromobenzyl tertiary/secondary/primary alcohols. Significantly, the method was applied to the synthesis of antiplatelet drug n-butyl phthalide and cytotoxic agonist 3a-[4′-methoxylbenzyl]-5,7-dimethoxyphthalide.
Domino One-Pot Process for the Synthesis of Isobenzofuran-1(3<i>H</i>)-ones via [Cu]-Catalysis Using Water as the Green Solvent
作者:Lodi Mahendar、Gedu Satyanarayana
DOI:10.1021/acs.joc.5b00888
日期:2015.7.17
An efficient domino one-pot strategy via [Cu]-catalyzed intermolecular "cyanation" of o-bromobenzyl alcohols -> in situ intramolecular "nudeophilic attack" -> "hydrolysis" is presented, for the synthesis of isobenzofuran-1(3H)-ones. Significantly, the reaction is successfully carried out under environmentally benign conditions, using water as sole green solvent.