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A titanium (IV) mediated one-pot double condensation synthesis of 5,6-dihydro-4H-pyran-4-ones

✍ Scribed by Joel Morris; Donn G. Wishka; George P. Luke; Thomas M. Judge; Ronald B. Gammill

Book ID: 108374695
Publisher: Elsevier Science
Year: 1997
Tongue: French
Weight: 585 KB
Volume: 53
Category: Article
ISSN: 0040-4020
DOI: 10.1016/s0040-4020(97)00378-5

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## Abstract 2‐Aryl‐2,3‐dihydro‐4__H__‐pyran‐4‐ones were prepared in one step by cyclocondensation of 1,3‐diketone dianions with aldehydes. The use of HCl (10%) for the aqueous workup proved to be very important to avoid elimination reactions of the 5‐aryl‐5‐hydroxy 1,3‐diones formed as intermediate