Formation of Hydro-1,3-diazines by the Reaction of Benzo[b]cyclohepta[e][1,4]oxazine with α,γ-Diamines
作者:Ohki Sato、Manabu Seshimo、Josuke Tsunetsugu
DOI:10.1039/a707825k
日期:——
Contrary to a report that the reaction of benzo[b]cyclohepta[e][1,4]oxazine 1 with α,γ-diamine 2b produces 1,2,3,4-tetrahydrocyclohepta[b][1,4]diazepine 4, the product was found to be 2-phenyl-3,4,5,6-tetrahydropyrimidine 5b and is peculiar to the reaction of 1 with α,γ-diamines 2 as well as β-aminamide 7.
与有关苯并[ b ]环庚[[ e ] [1,4]恶嗪1与α,γ-二胺2b反应的报告相反,生成1,2,3,4-四氢环庚[ b ] [1,4]二氮杂4,发现该产物是2-苯基-3,4,5,6-四氢嘧啶5b,是1与α,γ-二胺2和β-氨基酰胺7的反应所特有的。
Cyclodehydration of <i>N</i>-(Aminoalkyl)benzamides under Mild Conditions with a Hendrickson Reagent Analogue
作者:Wendy A. Loughlin、Ian D. Jenkins、Maria J. Petersson
DOI:10.1021/jo401082q
日期:2013.7.19
Methods for the cydodehydration of N-(aminoalkyl)benzamides are few and employ harsh reaction conditions. We have found that the easily prepared phosphonium anhydrides 1 (Hendrickson reagent) or 2 can be used for cyclodehydration of N-(aminoalkyl)benzamides under very mild conditions (room temperature) to produce five-, six-, and seven-membered cyclic amidines. Good yields are obtained by employing a temporary trityl group protection strategy. Cyclic analogue 2 can be used when the product cyclic amidine is organic-soluble, thus producing water-soluble byproducts.