A novel propargyltitanation of acetylenes. Heteroatom substituent-dependent manifold in intermolecular coupling of allene and acetylene
摘要:
Titanium alkoxide-mediated coupling of functionalized allenes and acetylenes afforded various types of producuts, and the first propargyltitanation of acetylenes was achieved by the appropriate choice of allenes. (C) 2004 Elsevier Ltd. All rights reserved.
Regioselective Allene Synthesis and Propargylations with Propargyl Diethanolamine Boronates
摘要:
The utility of propargyl diethanolamine boronates as reagents for the preparation of allenes and homopropargylic alcohols is presented. Protonolysis with TFA and electrophilic substitution with N-halosuccinimides proceeded with inversion to provide the corresponding allene in high yield and regioselectivity. Alternatively, the propargylation of aldehydes was achieved with use of the in situ generated lithiated complex.