Synthesis of Methyl 2-Amino-3<i>H</i>-1-benzazepine-4-carboxylates and 2-(Cyanomethyl)-2,3-dihydro-1<i>H</i>-indole-2-carboxylates from Morita-Baylis-Hillman Acetates of 2-(Acylamino)benzaldehydes
作者:Kee-Jung Lee、Hee Lim、Young Song
DOI:10.1055/s-2007-990809
日期:2007.11
Methyl 2-Amino-3H-1-benzazepine-4-carboxylates or methyl 2-(cyanomethyl)-2,3-dihydro-1H-indole-2-carboxylates were prepared from the reaction of 3-[2-formamido-, 2-acetamido-, or 2-(propanoylamino)phenyl]-substituted methyl 2-(cyanomethyl)propenoates with sodium methoxide in methanol, respectively. The latter were readily obtained from the Morita-Baylis-Hillman reaction of N-protected 2-aminobenzaldehydes with methyl acrylate followed by acetylation and cyanation.
2-氨基-3H-1-苯并氮杂卓-4-羧酸甲酯或 2-(氰甲基)-2,3-二氢-1H-吲哚-2-羧酸甲酯分别由 3-[2-甲酰胺基、2-乙酰胺基或 2-(丙酰氨基)苯基]-取代的 2-(氰甲基)丙烯酸甲酯与甲醇中的甲醇钠反应制备而成。后者很容易从 N 保护的 2-氨基苯甲醛与丙烯酸甲酯的 Morita-Baylis-Hillman 反应中获得,然后进行乙酰化和氰化。
Organocatalytic Enantioselective Formal (4 + 2)-Cycloadditions of Phosphine-Containing Dipoles with Isocyanates
作者:Xuling Chen、Tao Wang、Zhongyue Lu、Pengfei Li
DOI:10.1021/acs.orglett.2c01154
日期:2022.4.29
Phosphine-catalyzed enantioselective formal (4 + 2)-cycloadditions of 2-(4H-benzo[d][1,3]oxazin-4-yl)acrylates with isocyanates have been developed for the first time. The initial SN2′ attack of the chiral phosphine organocatalyst on 2-(4H-benzo[d][1,3]oxazin-4-yl)acrylates generated the key phosphine-containing dipolar intermediates, and the subsequent formal cycloaddition with isocyanates furnished
首次开发了膦催化的 2-(4 H-苯并[ d ][1,3]恶嗪-4-基)丙烯酸酯与异氰酸酯的对映选择性形式 (4 + 2)-环加成反应。手性膦有机催化剂对 2-(4 H-苯并[ d ][1,3]oxazin-4-yl) 丙烯酸酯的初始 S N 2' 攻击产生了关键的含膦偶极中间体,随后与异氰酸酯以 60-84% 的收率和 61-92% 的 ee 提供范围广泛的 3,4-二氢喹唑啉-2-酮。