作者:Meng-Yang Chang、Tein-Wei Lee、Ru-Ting Hsu、Tzu-Lin Yen
DOI:10.1055/s-0030-1260147
日期:2011.10
Substituted tricyclic or tetracyclic quinoxalines, tricyclic pyridoquinoxalines and bis-quinoxalines were synthesized in high yields starting from cyclic ketones by the α-bromination of cyclic ketones with N-bromosuccinimide (NBS) followed by condensation of the resulting α-bromo ketones with 1,2-diaminobenzene, 3,4-diaminopyridine, or 3,3′-diaminobenzidine. condensation - halogenation - tandem reactions
Synthesis of 4,4-dialkoxy-3-piperidinols. Application to the synthesis of γ-acetate dehydropipecolinonitrile
作者:Meng-Yang Chang、Tein-Wei Lee、Chung-Han Lin
DOI:10.1016/j.tet.2011.04.102
日期:2011.7
N-bromosuccinimide in acetic acid and alkoxide ion-mediated α,α-dialkoxyhydroxylation. Under acidic condition, trimethyl orthoformate-mediated reaction of compound 7a yielded aminodienylester 8 in the presence of Ph3PCHCO2Et. The γ-acetate dehydropipecolinonitrile 4 was also synthesized via borontrifluoride etherate-promoted addition of compound 8 with trimethylsilyl cyanide and N-bromosuccinimide and selective
的4,4-二烷氧基-3- piperidinols合成7是由哌啶-4-酮的α-溴化进行5 与Ñ溴代琥珀酰亚胺在乙酸和醇盐离子介导的α,α-dialkoxyhydroxylation。在酸性条件下, 在Ph 3 P CHCO 2 Et存在下,原甲酸三甲酯介导的化合物7a反应生成氨基二烯基酯8。所述γ-醋酸dehydropipecolinonitrile 4还合成通过三氟化硼醚促进的加成化合物的8与氰化三甲基硅烷和Ñ溴代琥珀酰亚胺和选择性加氢。
Synthesis of (3-N-substituted-piperidin-4-ylidene)acetic Acid Ethyl Esters
作者:Meng-Yang Chang、Tein-Wei Lee
DOI:10.1002/jccs.201100619
日期:2012.7
convenient preparation of skeletons 2A and 2B (cyclic γ,δ‐diamino‐α,β‐unsaturated esters) is reported by a three‐step synthetic route based on a sequence of NBS‐mediated one‐pot α‐bromination/Wittig olefination of piperidin‐4‐one 3, nucleophilic addition with NaN3, and followed by PPh3‐promoted Staudinger reduction/substitution or CuI‐catalyzed Huisgen 1,3‐dipolar cycloaddition.
An Efficient Access to Novel Enantiomerically Pure Steroidal δ-Amino Acids
作者:Hans Wolf Sünnemann、Anja Hofmeister、Jörg Magull、Armin de Meijere
DOI:10.1002/chem.200601076
日期:2006.11.6
%). Tetracycles cis-7 a-c are the products of a subsequent 1,5-hydrogen shift to the thermodynamically more stable, more highly substituted diene units. Removal of the tert-butyl groups provided the novel steroidal delta-amino acid 9 a and the delta-amino acid derivatives 9 b, c in good yields (76-86 %).