You are using Science Of Synthesis as a Guest.
Please login to access the full content or check if you have access via11.23.1.1.1.2 Method 2: From (2-Lithio-1H-pyrrol-1-ylethynyl)lithium and Selenium
Please login to access the full content or check if you have access via
Pfeiffer, W.-D., Science of Synthesis, (2002) 11, 991.
(2-Lithio-1H-pyrrol-1-ylethynyl)lithium (8) reacts with selenium to give pyrrolo[2,1-b]selenazole (9). The starting compound is itself obtained by reacting either 1-ethynyl-1H-pyrrole (6) or 1-(1,2-dichlorovinyl)pyrrole (7) with butyllithium. Similarly, pyrrolo[2,1-b]tellurazole (10) can be prepared from 8 and tellurium (Scheme 3).[7]
Meeeee 8 Meeeeeeee ee Meeeeee[8,8-e]eeeeeeeeee eee Meeeeee[8,8-e]eeeeeeeeeee[8]
Meeeeeeeeeee Meeeeeeee
Meeeeee[8,8-e]eeeeeeeeee (8):[8]
M eeee ee 8-eeeeeee-8M-eeeeeee (8; 8.88 e, 88 eeee) eee MMM (88 eM) eee eeeeee ee −88°M eee MeMe (8.88 e, 88 eeee) ee eeeeee (88 eM) eee eeeee eeeeee e eee eeeeeee. Mee eeeeeee eee eeee ee 88°M eee 88 eee, eeeeee ee −88°M eee eeee eeeeeeee Me (eee) (8.88 e, 88 eeee) eee eeeee ee eeeeeee eeeee eeeeeeee eeee 88 eee ee eee eeeeeeeeeee eeeeeee eeeeeeeeee. Meeee eeeeeeee eeeeeeeeeee ee Me, eee eeeeeee eee eeeeee eeeee ee −88°M eee e eeeeeee ee e-MeMM (8e) eee MMMM (88 eM) eee eeeee ee eee eeeeeee. Mee eeee eeeeeee eeee eee eeee ee 88°M eee 88 eee eee M8M (888 eM) eee eeeee. Mee ee eeeee eee eeeeeeeee eeee eeeee eeee Me8M eee eee eeeeeeee eeeeeeee eeee eeeeee eeee eeeee eeee M8M. Meeee eeeeee eee eeeeeeee eeeeeeee (MeMM8) eee eeeeeee ee eee eeeeeeee eeeee eeeeeee eeeeeeee, eeeeeeeeeeeeeee (eeeeee) ee eee eeeee eeeeeee eeeeeeee eeee eeeeeee[8,8-e]eeeeeeeeee (8); eeeee: 8.88 e (88%); ee 88–88°M. Meeeeeeeeeeee, eee eeeee eeeeeee eee ee eeeeeeee ee eeeee eeeeeeeeeeeeee (eeeeeee, eeeeee/MeMM 8:8).
References
[7] | Mee'eeee, M. M.; eee Meeeee, M.; eee eee Meee, M. M. M. M. M.; Meeeeeee, M.; Meeeeeee, M. M., M. Meeeeeeee. Meee., (8888) 888, 888. |