中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,3-二氢噻吩并[3,4-b][1,4]二噁英-5-甲醇 | 3,4-ethylenedioxythenyl alcohol | 859851-01-7 | C7H8O3S | 172.205 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,3-二氢苯并[3,4-B][1,4]二恶英-5,7-二苯甲醛 | 3,4-ethylenedioxythiophene-2,5-dicarboxaldehyde | 211235-87-9 | C8H6O4S | 198.199 |
—— | 2,3-dihydro-7-vinylthieno[3,4-b][1,4]dioxine-5-carbaldehyde | 852054-44-5 | C9H8O3S | 196.227 |
2,3-二氢-噻吩并[3,4-b][1,4]二噁英-5-羧酸 | 2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carboxylic acid | 260063-21-6 | C7H6O4S | 186.188 |
5-溴-2-(3,4-乙烯基双氧噻吩)甲醛 | 7-bromo-2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbaldehyde | 852054-42-3 | C7H5BrO3S | 249.085 |
2,3-二氢噻吩并[3,4-b][1,4]二噁英-5-甲醇 | 3,4-ethylenedioxythenyl alcohol | 859851-01-7 | C7H8O3S | 172.205 |
—— | (E)-1,2-bis(2-(3,4-ethylenedioxy)thienyl)vinylene | —— | C14H12O4S2 | 308.379 |
7-溴-2,3-二氢噻吩并[3,4-b][1,4]二噁英-5-甲腈 | 7-Bromo-2,3-dihydrothieno[3,4-b][1,4]dioxine-5-carbonitrile | 884507-59-9 | C7H4BrNO2S | 246.084 |
—— | S-(5-formyl-3,4-ethylenedioxythiophen-2-yl)-3-thiopropionic acid | —— | C10H10O5S2 | 274.318 |
—— | S-(5-formyl-3,4-ethylenedioxythiophen-2-yl)-5-thiopentanoic acid | —— | C12H14O5S2 | 302.372 |
—— | 2-bromo-4-[2-(3,4-ethylenedioxythien-2-yl)vinyl]pyridine | —— | C13H10BrNO2S | 324.198 |
The regioselective ipso-formylation of electron-rich, 3,4-push-pull-substituted 2-chlorothiophenes under Vilsmeier-Haack conditions was performed in good yields. The synthetic scope of this new reaction was explored using various halothiophenes, chloroanilines, and 1-methyl-3-chloroindole. In comparison with their structural C-H analogs the chlorinated thiophenes, anilines, and the indole proved to be less reactive toward electrophilic attack by chloromethyleniminium salts.
在Vilsmeier-Haack条件下,对电子丰富、3,4-推拉取代的2-氯噻吩进行了区域选择性的异位甲酰化反应,并以较好的产率获得了产物。通过使用不同的卤代噻吩、氯代苯胺和1-甲基-3-氯吲哚,探索了这一新反应的合成范围。与它们的C-H结构类似物相比,氯化的噻吩、苯胺和吲哚对氯甲基亚胺盐的亲电攻击表现出较低的活性。