Ionic hydrogenation has not been extensively explored, but is advantageous for challenging substrates such as unsaturated intermediates. Reported here is an iridium-catalyzedhydrogenation of oxocarbenium ions to afford chiral isochromans with high enantioselectivities. A variety of functionalities are compatible with this catalytic system. In the presence of a catalytic amount of the Brønsted acid
Catalytic Asymmetric Alkynylation of C1-Substituted C,N-Cyclic Azomethine Imines by CuI/Chiral Brønsted Acid Co-Catalyst
作者:Takuya Hashimoto、Masato Omote、Keiji Maruoka
DOI:10.1002/anie.201104017
日期:2011.9.12
up: The title reaction was developed for the synthesis of chiral tetrahydroisoquinoline derivatives with a tetrasubstituted carbon center at the C1‐position (see scheme, Bz=benzoyl, pybox=2,6‐bis(2‐oxazolinyl)pyridine). The reaction was facilitated effectively by the co‐catalyst system composed of copper(I)/Ph‐pybox and an axiallychiraldicarboxylicacid.
Process for preparation of highly pure Fingolimod hydrochloride
申请人:Chaturvedi Akshay Kant
公开号:US11518733B2
公开(公告)日:2022-12-06
The present invention provides process for preparation of highly pure Fingolimod hydrochloride (I),
without involving the use of column chromatographic purification in the entire process. Fingolimod hydrochloride (I) obtained by the process of present invention may be useful as active pharmaceutical ingredient in pharmaceutical compositions for the treatment of autoimmune related disorder including multiple sclerosis.