Reductions with Metal Hydrides. XV. Reduction of 2-Tetrahydropyranyl and 2-Tetrahydrofuranyl Thioethers with Lithium Aluminum Hydride- Aluminum Chloride
Enantioselective Synthesis of β-Hydrazino Alcohols Using Alcohols and <i>N</i>-Boc-Hydrazine as Substrates
作者:Zhihao Cui、Da-Ming Du
DOI:10.1021/acs.orglett.6b02841
日期:2016.11.4
enantioselective approach for the synthesis of α-hydrazino aldehydes is described that utilizes alcohols and N-Boc hydrazine instead of the conventional combination of aldehydes with azodicarboxylates. This protocol is enabled by merging in situ aerobic dual oxidation with asymmetricorganocatalysis. This reaction also exhibits a high tolerance for varieties of substituents on the alcohol component. This approach
作者:Jonathan Z. Shezaf、Catherine G. Santana、Connor Saludares、Edward S. Briceno、Ken Sakata、Michael J. Krische
DOI:10.1021/jacs.3c06734
日期:2023.8.23
correlation between metal-centered stereogenicity and regioselectivity in a catalytic process is described. Alternate pseudo-diastereomeric chiral-at-ruthenium complexes of the type RuX(CO)[η3-prenyl][(S)-SEGPHOS] form in a halide-dependent manner and display divergent regioselectivity in catalytic C–C couplings of isoprene to alcohol proelectrophiles viahydrogen autotransfer. Whereas the chloride-bound ruthenium-SEGPHOS
描述了催化过程中金属中心立体异构性和区域选择性之间的第一个相关性。 RuX(CO)[η 3 -prenyl][( S )-SEGPHOS] 类型的替代假非对映手性钌络合物以卤化物依赖性方式形成,并在异戊二烯与异戊二烯的催化 C-C 偶联中表现出不同的区域选择性。醇亲电体通过氢自转移。氯化物结合的钌-SEGPHOS络合物更倾向于卤化物和羰基配体之间的反式关系,并提供羰基仲异戊二烯化的产物,而碘化物结合的钌-SEGPHOS络合物更倾向于卤化物和羰基配体之间的顺式关系,并提供羰基仲异戊二烯化的产物。羰基叔异戊二烯化的产物。通过31 P NMR 和 X 射线衍射对溶液和固相中的氯化物和碘化物结合的钌-SEGPHOS 配合物进行了表征。碘化物结合催化剂的密度泛函理论计算暗示了科廷-哈米特型场景,其中仲异戊二烯和叔异戊二烯钌配合物的平衡混合物中醛配位的过渡态是速率和产物决定的。因此,对以金属为中心的非
JURSIC, BRANKO;LADIKA, MLADEN;SUNKO, DIONIS E., GAZZ. CHIM. ITAL., 113,(1988) N 9, C. 613-616
作者:JURSIC, BRANKO、LADIKA, MLADEN、SUNKO, DIONIS E.
DOI:——
日期:——
US4209410A
申请人:——
公开号:US4209410A
公开(公告)日:1980-06-24
Jursic, Branco; Ladika, Mladen; Sunko, Dionis E., Gazzetta Chimica Italiana, 1988, vol. 118, # 9, p. 613 - 616