A catalyst-free allylic alkylation of stabilized phosphorus ylides with allylic carbonates via a regioselective SN2鈥?process is presented. Subsequent one-pot Wittig reaction with both aliphatic and aromatic aldehydes as well as ketenes provides structurally diverse skipped dienes (1,4-dienes) in generally high yields and moderate to excellent stereoselectivity with flexible substituent patterns. This one-pot SN2鈥?allylation鈥揥ittig strategy constitutes a convenient and efficient synthetic method for highly functionalized skipped dienes from readily available starting materials.