Highly Facialselective Synthesis of Pyranose 1,3-Oxazines and Their Ring Opening with Nucleophiles: A Novel Entry to 2-C-Branched Glycosides
摘要:
A TMSOTf-promoted cycloaddition of N-benzoyl-N,O-acetals with various glycals and 3-deoxy glycals affords pyranose 1,3-oxazines with high facial selectivity. In addition, a highly diastereoselective ring opening of the resulting pyranose 1,3-oxazines is reported. With diverse nucleophiles, these reactions take place upon heating at 80 degrees C. This novel ring-opening reaction affords structurally diversified 2-C-branched glycosides with three newly formed contiguous stereocenters.
A Highly Diastereoselective Access to Silicon-Containing Oxazines via the TMSOTf-Promoted Reactions of N-Benzoyl-N,O-acetals with Allyl Silanes
作者:Biao-Lin Yin、Zheng-Rong Li、Yuan-Xiu Zhang、Wei-Ping Tu
DOI:10.1055/s-0031-1289877
日期:2011.12
TMSOTf-promoted cycloaddition of N-benzoyl-N,O-acetals with allyl silanes to synthesize silicon-containing oxazines with high diastereoselectivities has been developed. The obtained products might be useful as building blocks in organic synthesis. N-benzoyl-N,O-acetals -oxazine- cycloaddition - diastereoselectivity
N-[1-(Benzotriazol-1-yl)alkyl]amides, versatile amidoalkylation reagents. 5. A general and convenient route to N-(.alpha.-alkoxyalkyl)amides
作者:Alan R. Katritzky、Wei Qiang Fan、Michael Black、Juliusz Pernak
DOI:10.1021/jo00028a028
日期:1992.1
N-[1-(Benzotriazol-1-yl)alkyl]amides 2, easily prepared from benzotriazole 1, an aldehyde, and an amide, react readily with a variety of primary and secondary alcohols under mild conditions to give N-(alpha-alkoxyalkyl)amides 3 in good yield.
Highly Facialselective Synthesis of Pyranose 1,3-Oxazines and Their Ring Opening with Nucleophiles: A Novel Entry to 2-<i>C</i>-Branched Glycosides
A TMSOTf-promoted cycloaddition of N-benzoyl-N,O-acetals with various glycals and 3-deoxy glycals affords pyranose 1,3-oxazines with high facial selectivity. In addition, a highly diastereoselective ring opening of the resulting pyranose 1,3-oxazines is reported. With diverse nucleophiles, these reactions take place upon heating at 80 degrees C. This novel ring-opening reaction affords structurally diversified 2-C-branched glycosides with three newly formed contiguous stereocenters.
N-Benzoylbenzaldimines and N-α-alkoxybenzylbenzamides
作者:S.W. Breuer、T. Bernath、D. Ben-Ishai
DOI:10.1016/0040-4020(67)85153-6
日期:1967.1
Thermal decomposition of benzylidenebisbenzamide (I) afforded N-benzoylbenzaldimines (II). Some of the chemical and spectroscopic properties of the aldimides and their methanol addition products (IV) are described.