نتایج جستجو برای: cyclic ketones
تعداد نتایج: 107112 فیلتر نتایج به سال:
The control of absolute configuration of quaternary stereocenters represents a great challenge in asymmetric catalysis.1-3 A conceptually direct and attractive approach is to transform prochiral ketones to chiral building blocks containing a quaternary stereocenter by a catalytic asymmetric C-C bond formation. The realization of this approach, however, has proven to be a formidable task.1,2d,3 ...
Oxidative carbon-carbon bond cleavage of N-alkoxycarbonylated cyclic amines was accomplished by NaNO2 in TFA to afford ω-amino carboxylic acid in high yield. Optically active 3-hydroxypiperidine derivatives and 3-pipecolinate, were converted to enantiomerically pure (R)-4-amino-3-hydroxybutanoic acid (GABOB) and (S)-2-pyrrolidone-4-carboxylate, respectively. It is well known that trifluoroaceti...
Abstract We report the development of a practical photocatalytic strategy to access various nitro‐containing cyclic compounds from olefins via semipinacol‐type rearrangement, cycloetherification, and lactonization reactions, employing N ‐nitrosuccinimide as bench‐stable, non‐metal‐based nitrating reagent. Mechanistic insights suggest that this light‐driven process occurs NO 2 radical pathway me...
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