Stereoselective Synthesis of Chiral 4-(1-Chloroalkyl)-β-Lactams Starting from Amino Acids and Their Transformation into Functionalized Chiral Azetidines and Pyrrolidines
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چکیده
منابع مشابه
Stereoselective synthesis of perillaldehyde-based chiral β-amino acid derivatives through conjugate addition of lithium amides
The Michael addition of dibenzylamine to (+)-tert-butyl perillate (3) and to (+)-tert-butyl phellandrate (6), derived from (S)-(-)-perillaldehyde (1), resulted in diastereomeric β-amino esters 7A-D in a moderately stereospecific reaction in a ratio of 76:17:6:1. After separation of the diastereoisomers, the major product, cis isomer 7A, was quantitatively isomerized to the minor component, tran...
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کاتالیست یک سنتز جدید برای تیواترها توصیف شده است. واکنش الکل ها با آریل، هتروآریل و آلکیل تیو ل ها درحضور 1،3،5- تری آزو- 2،4،6- تری فسفرین-2،2،4،4،6،6 هگزاکلراید ((tapc به عنوان یک کاتالیست موُثر، بازده های خوب تا عالی از تیواترها را حاصل می کند. علاوه براین، واکنش تحت شرایط بدون فلز و بدون حلال پیش می رود، بنابراین یک مکمل جالب برای روش های شناخته شده سنتز تیواترها ارائه می دهد. یک مکانیسم ا...
15 صفحه اولTriclorosilane-mediated stereoselective synthesis of β-amino esters and their conversion to highly enantiomerically enriched β-lactams.
A highly stereoselective trichlorosilane-mediated reduction of N-benzyl enamines was developed; the combination of a low cost, easy to make metal-free catalyst and an inexpensive chiral auxiliary allowed to perform the reaction on substrates with different structural features often with total control of the stereoselectivity. By easy deprotection through hydrogenolysis followed by conversion of...
متن کاملCHIRAL SEPARATIONS Amino Acids and Derivatives See III /AMINO ACIDS AND DERIVATIVES: CHIRAL SEPARATIONS
use by the OPCW inspectorate. Use of GC with one or more spectrometric technique such as mass spectrometry is required to conRrm the presence of chemical warfare agents. For this reason many analyses are carried out by GC-MS under electron impact or chemical ionization conditions. For analyses involving low levels of chemical warfare agents in the presence of high levels of interfering chemical...
متن کاملAmino Acids and Derivatives: Chiral Separations
particularly because with TLC various phase systems can be checked at the same time without expensive apparatus. TLC will continue to serve as a useful method for daily routine control analyses to identify and determine the purity of a variety of compounds, including enantiomers, with ease and speed, and can be readily modiRed for new situations. A wide choice for separation conditions will alw...
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ژورنال
عنوان ژورنال: The Journal of Organic Chemistry
سال: 2010
ISSN: 0022-3263,1520-6904
DOI: 10.1021/jo101220q