Enantiodivergent Steglich rearrangement of O-carboxylazlactones catalyzed by a chirality switchable helicene containing a 4-aminopyridine unit
作者:Chien-Tien Chen、Cheng-Che Tsai、Pei-Kang Tsou、Gou-Tao Huang、Chin-Hui Yu
DOI:10.1039/c6sc02646j
日期:——
A pseudo-enantiomeric pair of optically switchable helicenes containing a catalytic 4-N-methylaminopyridine (MAP) bottom unit and a C2-symmetric, (10R,11R)-dimethoxymethyl-dibenzosuberane top template was synthesized. They underwent complementary photoswitching at 290 nm (P/M′, <1/>99) and 340 nm (P/M′, 91/9) and unidirectional thermo-rotation at 130 °C (P/M′, >99/<1). They were utilized to catalyze
合成了含有催化的4- N-甲基氨基吡啶(MAP)底部单元和C 2对称(10 R,11 R)-二甲氧基甲基-二苯并亚戊烷顶部模板的可光学转换的螺旋对映体的对映体对映体。他们在290 nm(P / M ',<1 /> 99)和340 nm(P / M ',91/9)处进行互补光开关,并在130°C(P / M ',> 99 / <1)。它们被用来催化O-对C的对映异构Steglich重排。-羧基内酯,形成两种对映体,分别具有高达91%ee(R)和94%ee(S)的对映体。