Entry	R	R₁	X	Yields (%)^b	Mp (˚C)
Entry	R	R₁	X	Yields (%)^b	Found	Reported [lit.]
4a	/	OEt	O	87	200~201	200~201 [13]
4b	4-CH₃	OEt	O	93	212~214	215~216 [14]
4c	2-OCH₃	OEt	O	74	257~259	256~257 [15]
4d	3-OCH₃	OEt	O	85	204~208	206~208 [16]
4e	4-N(CH₃)₂	OEt	O	87	252~255	256~257 [17]
4f	2-F	OEt	O	93	230~236	235~237 [18]
4g	3-F	OEt	O	82	205~207	209~211 [19]
4h	4-F	OEt	O	87	176~178	175~177 [20]
4i	2-Cl	OEt	O	82	213~215	213~215 [21]
4j	2,3-(Cl)₂	OEt	O	87	212~215	215~216 [22]
4k	2-Br	OEt	O	86	197~199	205~207 [23]
4l	3-Br	OEt	O	73	180~182	178~179 [24]
4m	2-Cl-6-F	OEt	O	78	247~249	246~248 [25]
4n	2-NO₂	OEt	O	69	213~216	213~215 [21]
4o	2,4-(NO₂)₂	OEt	O	77	204~206
4p	4-OH	OEt	O	81	223~225	227~228 [14]
4q	3,4-(OH)₂	OEt	O	90	229~231	233~235 [26]
4r	2-F	OEt	S	93	86~92	87~90 [27]
4s	3-Br-4-F	OEt	S	84	208~210
4t	3-OCH₃	i-PrO	O	81	189~191
4u	4-N(CH₃)₂	i-PrO	O	90	241~243