Diels–Alder and Stille Coupling Approach for the Short Protecting-Group-Free Synthesis of Mycophenolic Acid, Its Phenylsulfenyl and Phenylselenyl Analogues, and Reactive Oxygen Species (ROS) Probing Capacity in Water
作者:Mahesh B. Halle、Tesla Yudhistira、Woo-Hyun Lee、Sandip V. Mulay、David G. Churchill
DOI:10.1021/acs.orglett.8b01327
日期:2018.6.15
Stille cross-coupling approach includes key transformations, allowing for a competitive synthesis which involves a rare halophenol Stille cross-coupling study. The phenylselenyl and phenylsulfenyl analogues were prepared as novel compounds in good overall yield. The applicability of one of the intermediates as a potential probe for reactive oxygen species (ROS) in water is investigated.
申请人:Korea Advanced Institute of Science and Technology 한국과학기술원(319980988661) BRN ▼314-82-01980
公开号:KR20200079919A
公开(公告)日:2020-07-06
본 발명은 마이코페놀산, 이의 페닐설페닐 및 페닐셀레닐 유도체 화합물의 합성방법, 상기 합성방법에 의해 합성된 신규한 마이코페놀산의 페닐설페닐 또는 페닐셀레닐 유도체 화합물에 관한 것이다. 본 발명의 새로운 마이코페놀산의 합성방법은 종래 합성방법과 비교하여 보호기를 사용하지 않으며 반응단계가 간단하고 높은 수득율을 갖는다. 따라서, 본 발명의 합성방법은 마이코페놀산을 높은 수율의 대량생산 방법에 유용하게 사용될 수 있다.
Direct Catalytic Asymmetric Vinylogous Additions of α,β‐ and β,γ‐Butenolides to Polyfluorinated Alkynyl Ketimines
作者:Barry M. Trost、Chao‐I. (Joey) Hung、Manuel J. Scharf
DOI:10.1002/anie.201806249
日期:2018.8.27
We report a Zn‐ProPhenol catalyzed asymmetric Mannich reaction between butenolides and polyfluorinated alkynyl ketimines to obtain vinylogous products featuring two contiguous tetrasubstituted stereogenic centers. Notably, this is the first successful use of ketimines in the ProPhenol Mannich process, and the reaction offers a new approach for the preparation of pharmaceutically relevant products possessing
Zn-ProPhenol Catalyzed Enantio- and Diastereoselective Direct Vinylogous Mannich Reactions between α,β- and β,γ-Butenolides and Aldimines
作者:Barry M. Trost、Elumalai Gnanamani、Jacob S. Tracy、Christopher A. Kalnmals
DOI:10.1021/jacs.7b11361
日期:2017.12.20
We report a Zn-ProPhenol catalyzedreaction between butenolides and imines to obtain tetrasubstituted vinylogous Mannich products in good yield and diastereoselectivity with excellent enantioselectivity (97 to >99.5% ee). Notably, both α,β- and β,γ-butenolides can be utilized as nucleophiles in this transformation. The imine partner bears the synthetically versatile N-Cbz group, avoiding the use of